/*
 *
 *  * Licensed to the Apache Software Foundation (ASF) under one or more
 *  * contributor license agreements.  See the NOTICE file distributed with
 *  * this work for additional information regarding copyright ownership.
 *  * The ASF licenses this file to You under the Apache License, Version 2.0
 *  * (the "License"); you may not use this file except in compliance with
 *  * the License.  You may obtain a copy of the License at
 *  *
 *  *     http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  * Unless required by applicable law or agreed to in writing, software
 *  * distributed under the License is distributed on an "AS IS" BASIS,
 *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  * See the License for the specific language governing permissions and
 *  * limitations under the License.
 *
 */

package org.apache.nifi.minifi.commons.schema.common;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class CollectionUtil {
    public static <T> List<T> nullToEmpty(List<T> list) {
        return list == null ? Collections.emptyList() : list;
    }

    public static <T> Set<T> nullToEmpty(Set<T> set) {
        return set == null ? Collections.emptySet() : set;
    }

    public static <K, V> Map<K, V> nullToEmpty(Map<K, V> map) {
        return map == null ? Collections.emptyMap() : map;
    }
}
